Expand z plus 11 times z plus 11 = (z+11)(z+11) = z2 + 22z + 121.
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True
x + y + z = x + z + y is the commutative property of addition.
Without an equality sign and not knowing the plus or minus value of 81 it can't be solved. If you mean: z+81 = 9z-7 Then: z-9z = -7-81 => -8z = -88 By dividing both sides by -8: z = 11
z = -4 x-5 y+2
3x + 2 = 82